/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.metadata.mnode;

public class MNodeUtils {

    /**
     * When a measurement, represented by template or MeasurementMNode, is going to be added to a
     * node, the node should be set to entity. Before invoking this method, lock the related MTree
     * part first.
     *
     * @param node node to be transformed
     * @return generated entityMNode
     */
    public static IEntityMNode setToEntity(IMNode node) {
        IEntityMNode entityMNode;
        if (node.isEntity()) {
            entityMNode = node.getAsEntityMNode();
        } else {
            if (node.isStorageGroup()) {
                entityMNode =
                        new StorageGroupEntityMNode(
                                node.getParent(), node.getName(), node.getAsStorageGroupMNode().getDataTTL());
                node.moveDataToNewMNode(entityMNode);
            } else {
                entityMNode = new EntityMNode(node.getParent(), node.getName());
                if (node.getParent() != null) {
                    node.getParent().replaceChild(node.getName(), entityMNode);
                } else {
                    node.moveDataToNewMNode(entityMNode);
                }
            }
        }
        return entityMNode;
    }

    /**
     * When there's no measurement, represented by template or MeasurementMNode, is under this
     * entityMNode, it should not act as entity anymore. Before invoking this method, lock related
     * MTree structure first.
     *
     * @param entityMNode node to be transformed
     * @return generated NoEntity node
     */
    public static IMNode setToInternal(IEntityMNode entityMNode) {
        IMNode node;
        IMNode parent = entityMNode.getParent();
        if (entityMNode.isStorageGroup()) {
            node =
                    new StorageGroupMNode(
                            parent, entityMNode.getName(), entityMNode.getAsStorageGroupMNode().getDataTTL());
        } else {
            node = new InternalMNode(parent, entityMNode.getName());
        }

        if (parent != null) {
            parent.replaceChild(entityMNode.getName(), node);
        }
        return node;
    }
}
